Abstract
Recently, a gamma gamma collider based on the existing 17.5 GeV linac of the European XFEL has been proposed. High-energy photons will be generated by Compton scattering of laser photons with a wavelength of 0.5–1{,upmu mathrm m} on electrons. Such a photon collider covers the range of invariant masses W_{gamma gamma } <12{mathrm {,Ge V!/}c^2}. The physics program includes spectroscopy of C -even resonances (c-, b-quarkonia, 4-quark states, glueballs) in various J^P states. Variable circular and linear polarizations will help in determining the quantum numbers. In this paper, we present a summary of measured and predicted two-photon widths of various resonances in the mass region 3–12 {mathrm {,Ge V!/}c^2} and investigate the experimental possibility of observing these heavy two-photon resonances under the conditions of a large multi-hadron background. Registration of all final particles is assumed. The minimum values of varGamma _{gamma gamma }(W) are obtained at which resonances can be detected at a 5sigma confidence level in 1 year of operation.
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